The digitization of slides is often tedious. It’s quick with this combination of modified slide projector and digital camera, which is automated by Rasp Pi.

Most of them have probably not made new slide recordings for a long time, but many still have hundreds or even thousands of photos slumbering in storage rooms – often with valuable memories. The problem: The digitization of slide recordings at companies is not really cheap, especially with large quantities. Slide scanners that you can buy work like conventional scanners, you can’t process more than a few slides at once, so the time required is extremely high. This leaves only a DIY solution: a slide projector with an upstream camera and central control by a Raspberry Pi Zero. The whole thing is built up more functionally and with minimal effort, because usually you only digitize your slide archive once and then you can dismantle the structure again.

If you have large quantities of slide recordings at home , usually also has the associated projector. This actually works according to a simple principle: the slide recording is illuminated by a strong light source and the resulting image is projected onto a screen. Instead of a screen, a self-made slide scanner requires a camera with a macro lens or at least a lens with a large focal length and extension rings or a macro adapter, which has a similar magnifying effect. You can find more information in the article “Alternative optics for the ESP 32 – CAM “.

A macro adapter can be a conventional Turn telephoto lens into a limited macro lens – this is definitely sufficient for the DIY slide scanner.

The image that would actually be projected is illuminated from behind by the projector lamp and can easily be taken as a digital photo with the camera and post-processed if necessary. So that the entire image can be recorded as fully as possible, the lens of the camera must of course be enlarged enough and close enough to the projector, as is the case with macro shots.

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